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Anchoring Co3O4 on BiFeO3: achieving high photocatalytic reduction in Cr(VI) and low cobalt leaching

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Abstract

A novel Co3O4–BiFeO3 nanocomposite was successfully prepared via a facile hydrothermal method followed by an impregnation process and well characterized with XRD, TEM, FTIR, XPS, UV–Vis DRS and PL spectrum. XPS and TEM analyses reveal that Co3O4 nanoparticles were successfully anchored on the BiFeO3. The photocatalytic activities of prepared photocatalysts were evaluated by removal of Cr(VI) under visible light (300 W Xe lamp irradiation). The results indicate that the 0.8% CO3O4–BiFeO3 (Co0.8Bi) sample calcined at 500 °C for 4 h showed the best performance, and the rate constant k of Cr(VI) reduction over Co0.8Bi is about 13.7- and 23.3-fold compared with pure BiFeO3 and Co3O4, respectively. More importantly, the CO3O4-BiFeO3 catalyst exhibited highly chemical stability with Co leaching of lower than 34.5 μgL−1, which is attributed to a strong interaction between Bi and Co components in Co3O4–BiFeO3. The effects of Co3O4 loading, calcination temperature and initial pH on catalytic activity and cobalt leaching were optimized.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 21571132, 11604222), the Open Fund of National Key Laboratory of Rare Earth Resources Utilization (RERU2017005), the key project of Department of Education of Liaoning Province (LZGD2017002), and the Liaoning Provincial Natural Science Foundation of China (Grant No. 201601155).

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Authors and Affiliations

  1. Department of Physics, School of Science, Shenyang University of Technology, Shenyang, 110870, People’s Republic of China

    Xuefeng Shi, Shanyu Quan, Linmei Yang & Cong Liu

  2. Department of Chemistry, School of Science, Shenyang University of Technology, Shenyang, 110870, People’s Republic of China

    Fanian Shi

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  1. Xuefeng Shi
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Shi, X., Quan, S., Yang, L. et al. Anchoring Co3O4 on BiFeO3: achieving high photocatalytic reduction in Cr(VI) and low cobalt leaching. J Mater Sci 54, 12424–12436 (2019). https://doi.org/10.1007/s10853-019-03816-x

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